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125B · 2 knobs

Aion FX

Orpheus SiliconFuzz

Based on the Mosrite Fuzzrite· 3 other boards clone it

Category
Fuzz
Controls
Depth · Volume
Difficulty
Beginner
Price
$12.50in stock

From the vendor

An updated version of the classic fuzz from the late 1960s, featuring silicon transistors in a unique two-stage blending arrangement.

The Orpheus Silicon Fuzz is based on the silicon version of the Mosrite Fuzzrite, which replaced the germanium version in 1968 around the time that the Fuzz Face and other fuzz circuits were moving to silicon as well. As with the germanium version, it was designed by Ed Sanner.

The circuit topology is largely the same as the germanium version, but it runs on modern negative-ground power due to the NPN transistors, whereas the germanium version uses a charge pump inverter. The two circuits have very different fuzz textures and both are worth your time. The silicon version seems to have been much more widespread, and was whitelabeled or cloned as the Orpheum Fuzz, Guild Foxey Lady, and Electro-Harmonix Axis Fuzz.

Catalinbread released an adaptation in 2010 called the Merkin Fuzz. Later in 2015, they teamed up with the Moseley estate and Ed Sanner to release an official reissue of the Fuzzrite, which was based on the silicon version. The germanium version followed in 2023, and included a “vintage/modern” toggle switch that reduces the steep bass cut of the original and fills out the midrange of the effect for a more modern sound.

We have ported this switch to the silicon version of the Fuzzrite circuit, which suffers from the same issues in the stock configuration.

Schematic

The schematic is in the vendor's build document, page 7. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 30 rows

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RefValueNormalizedTypeNotes
Resistors 10
R3470k470kMetal film resistor, 1/4WOrpheum: 10M; Axis/Foxey: omit (leave empty)
R4470k470kMetal film resistor, 1/4WOrpheum & Axis/Foxey: 22k
R8470k470kMetal film resistor, 1/4WOrpheum: 1M; Axis/Foxey: omit (leave empty)
R9470k470kMetal film resistor, 1/4WOrpheum & Axis/Foxey: 47k
R1222k22kMetal film resistor, 1/4WSome versions of the Fuzzrite omit this resistor. See build notes.
R131M21.2MMetal film resistor, 1/4WOrpheum & Axis/Foxey: omit (leave empty)
R14100k100kMetal film resistor, 1/4WOrpheum & Axis/Foxey: omit (leave empty)
R15100R100Metal film resistor, 1/4WPower supply filter resistor.
RPD2M22.2MMetal film resistor, 1/4WInput pull-down resistor.
LEDR10k10kMetal film resistor, 1/4WLED current-limiting resistor.
Capacitors 8
C147n47nFilm capacitor, 7.2 x 2.5mmOrpheum & Axis/Foxey: 100n
C347n47nFilm capacitor, 7.2 x 2.5mmOrpheum & Axis/Foxey: 100n
C62n22.2nFilm capacitor, 7.2 x 2.5mmAxis/Foxey: 3n3
C74n74.7nFilm capacitor, 7.2 x 2.5mmPart of the Mode switch mod. Can increase to 8n2 for more bass.
C82n22.2nFilm capacitor, 7.2 x 2.5mmAxis/Foxey: 3n3
C94n74.7nFilm capacitor, 7.2 x 2.5mmPart of the Mode switch mod. Can increase to 8n2 for more bass.
C10100uF100uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C11100n100nMLCC capacitor, X7RPower supply filter capacitor.
Diodes 1
D11N58171N5817Schottky diode, DO-41
Transistors 2
Q12N39042N3904BJT transistor, NPN, TO-92
Q22N39042N3904BJT transistor, NPN, TO-92
Potentiometers 2
DEPTH500kBB500k16mm right-angle PCB mount potOrpheum: 1MB; Axis/Foxey: 100kB
VOLUME50kAA50k16mm right-angle PCB mount potOrpheum: 100kB; Axis/Foxey: 100kA
Switches 2
MODEDPDT on-onDPDT ON-ONToggle switch, DPDT on-on
FSW3PDT3PDTStomp switch, 3PDT
Jacks & sockets 3
IN1/4" stereo1/4" STEREO1/4" phone jack, closed frameSwitchcraft 112BX or equivalent.
OUT1/4" mono1/4" MONO1/4" phone jack, closed frameSwitchcraft 111X or equivalent.
DC2.1mm2.1MMDC jack, 2.1mm panel mountMouser 163-4302-E or equivalent.
Hardware 2
BATTBattery snapBATTERY SNAP9V battery snapOptional. Use the soft plastic type—the hard-shell type will not fit.
ENC125B125BEnclosure, die-cast aluminumCan also use a Hammond 1590N1.

Other boards based on the Mosrite Fuzzrite